October, ’23] 
primm & hartley: box leaf miner control 
437 
first demonstrated. A few plants were then sprayed with one part of 
oil diluted with twenty of water and were left for observation. Little 
foliage injury followed and when thoroughly dried there was left a 
heavy oily blanket which was evenly distributed over both the old and 
new growth and which did not wash off in a heavy rain. 
Because of the large number of heavily infested boxwood on one of 
the private estates near Philadelphia, the cooperation of the super¬ 
intendent was obtained and a long section of hedge of Buxus sempervirens 
was reserved for treatment with this oil, Preparations were made to 
spray the bulk of the boxwood with resin fish oil soap (ten pounds to 
fifty gallons) and “Nikoteen” (one pint to fifty gallons of the soap 
solution). A large nursery also adopted this treatment, using “Black 
Leaf 40” instead of the “Nikoteen.” It was discontinued by both 
parties after a few applications and the remaining sprays consisted en¬ 
tirely of the oil solution. A neighboring estate proposed to spray its 
boxwood with a good grade of “black jack” molasses (one part to three 
of water) and “Black Leaf 40” (one part to 264 of the molasses mixture). 
A commercial firm undertook the fumigation of about fifty fine specimen 
box on the latter estate with a guarantee of its success. The first ap¬ 
plications of spray were given on May 9th, the day after the emergence 
of the first adults. In all of the oil applications (1 20), “Black Leaf 40” 
was used (one part to 500 of the spray). 
Counts were made the first three days after the applications of the 
spray to determine the comparative number of adults which had 
emerged successfully, with the number found trapped in the spray and 
the number of extruded pupae which failed to emerge successfully. 
Similar counts were taken from twigs of bushes sprayed with the resin 
fish oil soap and the molasses mixtures. The final percentages of control 
are based upon counts made the following July of the number of eggs 
successfully hatched, as it was found a large percentage of the eggs which 
were deposited in both the treated and check plants were either in¬ 
fertile, or else did not develop from other causes which were not as¬ 
certained. The checks in each case were untreated plants of a similar de¬ 
gree of infestation as the plants which were treated. The oil spray was 
applied by the writers with a small compressed air sprayer; the molasses 
and resin fish oil soap sprays were applied by workmen on the estates 
with a barrel pump outfit. 
Oil Applications 
Exp. 1. Sprayed May gth with “Sun Miscible Oil” (1-20) and “Black Leaf 40” 
(1-500). 
